import java.util.List;

public class MySingleList implements IList{
    static class ListNode{
        public int val;
        public ListNode next;

        public ListNode(int val) {
            this.val = val;
        }
    }

    public ListNode hand;

    public void createList(){
        ListNode node1 = new ListNode(58);
        ListNode node2 = new ListNode(23);
        ListNode node3 = new ListNode(34);
        ListNode node4 = new ListNode(45);
        ListNode node5 = new ListNode(55);

        node1.next=node2;
        node2.next=node3;
        node3.next=node4;
        node4.next=node5;
        this.hand=node1;
    }

    @Override
    public void display() {
        //打印
        ListNode cur = hand;
        while (cur!=null){
            System.out.print(cur.val+" ");
            cur = cur.next;
        }
        System.out.println();
    }

    @Override
    public int size() {
        int len = 0;
        ListNode cur = this.hand;
        while (cur!=null){
            len++;
            cur = cur.next;
        }
        return len;
    }

    @Override
    public void addFirst(int data) {
        //头插
        ListNode node = new ListNode(data);
        node.next = this.hand;
        hand=node;
    }

    @Override
    public void addLast(int data) {
        //尾插法
        ListNode node = new ListNode(data);
        if(hand==null){
            hand=node;
        }
        ListNode cur = this.hand;
        while (cur.next!=null){
            cur = cur.next;
        }
        cur.next=node;
    }

    @Override
    public boolean contains(int key) {
        //查找
        ListNode cur = this.hand;
        while (cur!=null){
            if(cur.val==key){
                return true;
            }
            cur = cur.next;
        }
        return false;
    }

    @Override
    public void addIndex(int index, int data) {
        //任意插入
        int len = size();
        if(index < 0 || index > len){
            System.out.println("index 坐标不合法");
            return;
        }
        if(index == 0){
            addFirst(data);
        }
        if(index == len){
            addLast(data);
        }
        ListNode cur = this.hand;
        while (index-1 != 0){
            cur = cur.next;
            index--;
        }
        ListNode node = new ListNode(data);
        node.next = cur.next;
        cur.next = node;
    }

    @Override
    public void remove(int key) {
        //删除指定key的节点
        if(hand == null) {
            return;
        }
        if(hand.val == key) {
            hand = hand.next;
            return;
        }
        ListNode cur = findNodeOfKey(key);
        if(cur == null) {
            return;
        }
        ListNode del = cur.next;
        cur.next = del.next;
    }

    private ListNode findNodeOfKey(int key) {
        ListNode cur = hand;
        while (cur.next != null) {
            if(cur.next.val == key) {
                return cur;
            }
            cur = cur.next;
        }
        return null;
    }

    @Override
    public void removeAllKey(int key) {
        if(hand == null) {
            return;
        }
        ListNode prev = hand;
        ListNode cur = hand.next;
        while (cur != null) {
            if(cur.val == key) {
                prev.next = cur.next;
                cur = cur.next;
            }else {
                prev = cur;
                cur = cur.next;
            }
        }
        if(hand.val == key) {
            hand = hand.next;
        }
    }

    @Override
    public void clear() {
        ListNode cur = hand;
        while (cur != null) {
            ListNode curN = cur.next;
            cur.next = null;
            cur = curN;
        }
        hand = null;
    }
}
